Drying-machine.



F. G. SARGENT DRYING MACHINE.

APPLICATION FILED JULY 11. 1917.

Patented Mar. 19, 1918.

SHEETS-SHEET L F. G. SARGENT.

DRYING MACHINE.

APPLICATION HLED JULY 11. 1911.

1,259,675. Patented Mar. 19, 191&

2 SHEETS-SHEET 2 K nnnn was Wmr UMTFAE STATES PATENT @FFJTQE.

FREDERICK G. SARGENT, OF WES'IFORD, MASSACHUSETTS, ASSIGN'OR TO C. Cr.SARGENTS SONS CORPORATION, OF GRANITEVILLE, MASSACHUSETTS, A CORPORATIONOF MASSACHUSETTS.

DRYING-II IACHIINE.

Application filed July 11, 1917.

To all whom "it may concern:

Be it known that I, FREDERICK G. SAR- enn'r, a citizen of the UnitedStates, residing at Westford, in the county of Middlesex and State ofMassachusetts, have invented a new and useful Drying-Machine, of whichthe following is a specification.

This invention relates to a drying machine, particularly of the type inwhich wool, cotton or other similar substances are carried through adrying chamber by a movable screen or carrier.

It is the object .of my invention to improve the construction of suchdrying machines to the end that a more effective circulation of air maybe secured, thereby increasing the efficiency of the machine.

I have discovered that it is desirable in the operation of this type ofdrying machine to admit a certain amount of fresh outside air to themachine during the operation thereof and at the same time to exhaust andremove a corresponding portion of the air which has been circulatingthrough the stock. I have also found that it is desirable to recirculatea certain proportion of the air in the ma chine as by so doing it is notnecessary to heat up so large a quantity of the relatively cool outsideair. Accordingly, an important feature of my invention relates to adrying machine in which provision is made for recirculating a portion ofthe air passing through the stock and for exhausting and removing theremaining portion of the air, replacing the same with an equivalentamount of fresh air.

My invention further relates to arrangements and combinations of partswhich will be hereinafter described and more particularly pointed out inthe appended claims.

A preferred form of my invention is shown in the drawings, in whichFigure 1 is a front elevation of a portion of a drying machine embodyingmy improvements Fig. 2 is a transverse sectional elevation of theexhaust mechanism, taken along the line 2-2 in Fig. 1;

Fig. 3 is a horizontal sectional view taken along the line 33 in Fig. 1;

Fig. 4 is a longitudinal sectional elevation taken along the line 1- 1in Fig. 3, and

Fig. 5 is a transverse sectional elevation Specification of LettersPatent.

Patented Mar. 19, 1918.

Serial No. 179,811.

of the admission and circulating mechanism, taken along the line 55 inFig. 1.

Referring particularly to Fig. 1, I have shown a portion of a dryingmachine comprising a casing 10 through which the stock is carried by atraveling screen or carrier 11. Feeding mechanism 12 of the usual typemay be provided for depositing the stock upon the screen 11. Suitableheaters 13 are also provided for agitating the stock as it passesthrough the machine.

V1 hile I have shown in the drawings only a single unit or section ofthe machine it will be understood that a complete machine may. compriseseveral such units, the length of the machine depending upon the natureof the work which it is designed to perform.

Below the plane of the screen 11 the casing is divided by suitablepartitions into admission chambers 15 and 1.6, an air heating chamber 17and an exhaust chamber 18, the admission and exhaust chambers beingseparated by partitions 19 and 20 best shown in Figs. 3 and 4-. Thesepartitions extend vertically between the upper and lower runs of thescreen 11 and are connected by a bottom 21 to form the exhaust chamber18 having an opening 22 into a flue 23 through which the air is drawnout by an exhaust fan 24 and e ected through the outlet pipe 25.

The air heating chamber 17 is separated from the admission and exhaustchambers by a vertical partition 26 extending longitu dinally of themachine. Openings 27 and 28 through the lower part of the partition 26connect the admission chamber 15 and 16 to the air heating chamber 17.Doors 29 and 30 may be adjusted to regulate the amount of air flowingthrough the admission chambers, and fans 31 and 32 draw the air into theheating chamber which is provided with the usual coil of steam pipes 33.Through this coil the air circulates in an upward direction, finallypassing over the upper edge of the partition 26 and being drawn downthrough the stock S upon the screen 11.

In passing through the air heating chamber 17 air from the admissionchambers 15 and 16 is more or less uniformly distributed throughout theentire length of the chamber so that every portion of stock on thecarrier is subject to the drying action of the heated air. The air whichpasses through the stock near the two ends of the unit passes down intothe admission chambers 15 and 1G and is then recirculated by thecirculating fans 31 and 32. The air which passes through the stock nearthe center of the unit, however, passes directly to the exhaust chamber18 and is removed therefrom by the exhaust fan 2A.

It will thus appear that a certain portion of the air passing throughthe stock returns to the admission chambers and is recirculated, whilethe remaining portion of the air passes through the exhaust chamber andis returned to the atmosphere The air thus exhausted and removedisreplaced by a corresponding amount of fresh air, the admission of airbeing regulated by adjusting the doors '29 and 30. By thus recirculatingaportion of the air and exhausting and replacinganother portion of theair I am able to dry the stock in a very efficient and satisfactorymanner.

While I have herein shown a unit comprising two admission chambers and asingle interposed exhaust chamber, my invention is not limited to thisparticular arrangement as I may use either one or more admissionchambers in connection with one or more exhaust chambers, as is bestadapted to particular conditions.

Having thus described my invention, it will also be evident that otherchanges and modifications can be made'therein by those skilled in theart without departing from the spirit and scope of my invention as setforth in the claims, and I do not wish to be otherwise limited to thedetails herein disclosed, but what I claim is 1 In a drying machine, acasing, a stock supporting screen movable therein, air heating devices,exhaust apparatus, means to conduct heated air from said devices to thespace above said screen, and a plurality of separate passages below theworking run of said screen effective to receive said air, part of saidpassages being connected and effective to return a portion of said airto said heating means, and another part of said passages being connectedto said exhaust apparatus by which a portion of said air is removed fromsaid casing.

2. A drying machine having, in combination, a casing, a stock supportingscreen movable therein, separated adjacent air admission and air exhaustchambers beneath said screen, an air heating chamber, connections fromsaid admission chamber to said air heating chamber. below the level ofthe screen, and additional connections from said air heating chamber tosaid admission and exhaust chambers above the level of the stock,whereby a'portion of the air is recirculated and the remaining portionthereof is continuously exhausted.

3. A drying machine having, in combination, a casing, a stock carriermovable therein, said casing having inlet and exhaust passages beneaththe working run of said carrier, separated by partitions extendingtransversely of the casing, and each passage being open at the topthereof adjacent said carrier, a chamber to which all of said passagesare connected at one end, means to draw air into said casing, and meansto exhaust air therefrom, whereby a portion of the air passing throughthe screen and stock is recirculated and the remaining portion isremoved by the exhaust apparatus.

4:. A drying machine having, in combination, a casing, a stocksupporting screen movable therein, and an air heating chamber in saidcasing, the portion of said casing below the working run of said screenbeing separated into admission and exhaust chambers so disposed that airfrom said admission chamber passes through the heat ing chamber andthrough the screen with its supported stock, a portion of said air thenrecirculating through the admission and heating chambers, and theremaining portion passing out through the exhaust chamber. V

5. A drying machine having, in. combination, casing, a stock carriermovable therein, exhaust apparatus, and means to heat the air anddeliver it to the upper part of said casing above the carrier, the spacebelow the carrier being divided into. separate chambers connected tosaid heating means and said exhaust apparatus respectively.

6. A drying machine having, in combination, a casing, a stock supportingscreen -movable therein, exhaust apparatus, means to heat the air anddeliver it to the upper part of said casing above the stock carrier, andpartitions dividing the space below the screen into a pair of separatedchambers connected to said heating means and an, in terposed chamberconnected to the exhaust apparatus.

In testimony whereof I have hereunto affixed my signature.

FREDERICK G. SARGENT.

Copies 01 this patent may be obtained for five cents each, by addressingthe Commlssioner of Barents.

Washington, D. 0. r

